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TLS clients should reject static Diffie-Hellman

Document Type Expired Internet-Draft (individual)
Author Daniel Kahn Gillmor
Last updated 2019-06-07 (Latest revision 2018-12-04)
Stream (None)
Intended RFC status (None)
Expired & archived
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
Telechat date (None)
Responsible AD (None)
Send notices to (None)
This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at:


This draft addresses problematic proposals that contradict the expected security properties of TLS. In particular, the ETSI "Middlebox Security Protocol" standard deliberately weakens the cryptographic guarantees of TLS unilaterally by the server, using static Diffie-Hellman keys where ephemeral keys are expected. Responsible TLS clients should avoid connecting to servers that appear to implement such a specification.


Daniel Kahn Gillmor

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)